WO2021147136A1 - 柔性触控显示装置 - Google Patents

柔性触控显示装置 Download PDF

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Publication number
WO2021147136A1
WO2021147136A1 PCT/CN2020/077051 CN2020077051W WO2021147136A1 WO 2021147136 A1 WO2021147136 A1 WO 2021147136A1 CN 2020077051 W CN2020077051 W CN 2020077051W WO 2021147136 A1 WO2021147136 A1 WO 2021147136A1
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WO
WIPO (PCT)
Prior art keywords
touch
electrode
flexible
display device
sensing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2020/077051
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English (en)
French (fr)
Inventor
李远航
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Original Assignee
Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
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Application filed by Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd filed Critical Wuhan China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority to US16/652,425 priority Critical patent/US11079879B1/en
Publication of WO2021147136A1 publication Critical patent/WO2021147136A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means

Definitions

  • the present disclosure relates to the field of display technology, in particular to a flexible touch display device.
  • OLED display panels have the advantages of thinness, active light emission, fast response speed, large viewing angle, wide color gamut, high brightness, low power consumption and flexibility, etc., which have become display panel technology In the mainstream.
  • a flexible touch display device combining an organic light emitting diode display panel with a touch structure is the focus of research and development in the industry today.
  • the current flexible touch display device 100 includes an organic light emitting diode display panel 10 and a plurality of first touch electrodes 21 and a plurality of second touch electrodes 22 disposed on the organic light emitting diode display panel 10.
  • the plurality of first touch electrodes 21 and the plurality of second touch electrodes 22 constitute mutually capacitive touch electrodes in the shape of a metal mesh.
  • the plurality of first touch electrodes 21 and the plurality of second touch electrodes 22 are electrically connected to the touch chip through leads.
  • the flexible touch display device 100 when the flexible touch display device 100 is in a bent state, the distance between the first touch electrode 21 and the second touch electrode 22 will change, so that the first touch electrode 21
  • the capacitance value between the second touch electrode 22 and the second touch electrode 22 also changes accordingly, which causes the touch chip to misjudge the touch position.
  • the present disclosure provides a flexible touch display device, which includes a flexible display panel, several bridge points, and several bridge points. Sensing electrodes, a first insulating layer and several touch electrodes.
  • the flexible display panel includes a display area and a peripheral area surrounding the display area.
  • the several bridge points are arranged on the display area of the flexible display panel.
  • the plurality of sensing electrodes are arranged on the peripheral area of the flexible display panel for sensing the bending position and the bending degree of the flexible display panel.
  • the first insulating layer covers the bridge points, the sensing electrodes and the flexible display panel.
  • the first insulating layer is provided with a plurality of through holes in the display area, so that the two opposite side parts of each bridge point are exposed.
  • the plurality of touch electrodes are arranged on the first insulating layer in the display area, and are electrically connected to the plurality of bridge points through the plurality of through holes to form a metal mesh structure for sensing Measure the touched position of the flexible touch display device.
  • the flexible touch display device further includes a plurality of touch electrode leads and a touch chip.
  • the plurality of touch electrode leads are arranged on the first insulating layer in the peripheral area, and are electrically connected to the plurality of touch electrodes.
  • the touch control chip is electrically connected to the plurality of touch control electrode leads. When the display area is touched, several touch electrodes under the touched position generate a touch signal. The touch signal is transmitted to the touch chip through the touch electrode lead. The touch chip recognizes the touch position through the touch signal.
  • the touch signal is a capacitance change between a plurality of touch electrodes at the touch position.
  • the plurality of sensing electrodes are electrically connected to the touch chip.
  • the sensing electrode in the bent position generates a bending signal to the touch chip.
  • the touch chip recognizes the bending position and the bending degree through the bending signal, it compensates and corrects the touch signal generated by the touch electrode under the bending position.
  • each sensing electrode includes a comb-shaped transmitting electrode and a comb-shaped receiving electrode, and the transmitting electrode and the receiving electrode form a capacitor.
  • the bending signal is the capacitance change between the transmitting electrode and the receiving electrode in the sensing electrode at the bending position.
  • the plurality of sensing electrodes include a plurality of transmitting electrode lines and receiving electrode lines perpendicular to each other. Each transmitting electrode line and each receiving electrode line form a capacitor at the intersection.
  • the bending signal is the capacitance change at the intersection of the conductive line at the bending position.
  • the plurality of sensing electrodes include a plurality of conductive lines perpendicularly intersecting each other, and the plurality of conductive lines respectively generate capacitances with the ground.
  • the bending signal is the capacitance change between the conductive wire and the ground at the bending position.
  • the plurality of sensing electrodes include two conductive layers and a plurality of spacers separating the two conductive layers.
  • the bending signal is the amount of voltage change generated by the two conductive layers in contact with each other in the bending position.
  • the flexible touch display device further includes a scroll connected to one side of the flexible touch display device for rolling up or unfolding the flexible touch display device.
  • the plurality of sensing electrodes are arranged on a side parallel to the reel in the peripheral area.
  • the plurality of bridge points are arranged in an array in the display area.
  • the plurality of sensing electrodes are arranged on the peripheral area in the same line or in the same row as the plurality of bridge points.
  • a flexible touch display device Compared with the existing flexible touch display device, a flexible touch display device provided by the present disclosure is used to sense the bending position and degree of bending of the flexible touch display device by arranging several sensing electrodes in the peripheral area , And then compensate and correct the capacitance value between the touch electrodes at the bending position.
  • the plurality of sensing electrodes can be arranged under the plurality of touch electrode leads in the peripheral area, so as to avoid increasing the area of the peripheral area, which is beneficial to the design of a narrow frame.
  • FIG. 1 is a schematic cross-sectional view of a conventional flexible touch display device when it is in a flat state.
  • FIG. 2 is a schematic cross-sectional view of a conventional flexible touch display device when it is in a bent state.
  • FIG. 3 is a schematic diagram of a flexible touch display device according to an embodiment of the disclosure.
  • FIG. 4 is a schematic cross-sectional view of the flexible touch display device of FIG. 3 along the line B-B'.
  • FIG. 5 is a schematic diagram of the first arrangement of bridge points and sensing electrodes in the flexible touch display device of the disclosed embodiment.
  • FIG. 6 is a schematic diagram of a second arrangement of bridge points and sensing electrodes in the flexible touch display device of the disclosed embodiment.
  • FIG. 7 is a schematic diagram of the arrangement of touch electrodes and touch electrode leads in the X area of FIG. 3.
  • FIG. 8 is a schematic diagram of the arrangement of the sensing electrode and the sensing electrode lead in the Y area of FIG. 3.
  • FIG. 9 is a schematic diagram of the sensing electrode of FIG. 8 being the first mutual-capacitive sensing electrode.
  • FIG. 10 is a schematic diagram of the sensing electrode of FIG. 8 being a second mutual-capacitive sensing electrode.
  • FIG. 11 is a schematic diagram of the sensing electrode of FIG. 8 being a third type of mutual capacitance sensing electrode.
  • FIG. 12 is a schematic diagram of the sensing electrode of FIG. 8 being another mutual capacitance sensing electrode.
  • FIG. 13 is a partial enlarged view of the mutual-capacitive sensing electrode of FIG. 12.
  • FIG. 14 is a schematic diagram of the sensing electrode of FIG. 8 being a self-capacitive sensing electrode.
  • Fig. 15 is a partial enlarged view of the self-capacitive sensing electrode of Fig. 14.
  • FIG. 16 is a schematic diagram of the sensing electrode of FIG. 4 being a resistive sensing electrode.
  • the flexible touch display device 200 of the embodiment of the present disclosure includes a flexible display panel 110, a touch-sensing structure 120, a binding area 180 and a touch chip 300.
  • the flexible display panel 110 includes a display area AA and a peripheral area NA surrounding the display area AA.
  • the flexible display panel 110 may be an organic light emitting diode display panel, which includes a flexible substrate 111, a thin film transistor layer 112, an organic light emitting diode layer 113, and a thin film encapsulation layer 114 in order from bottom to top.
  • the touch-sensing structure 120 is formed on the thin film packaging layer 114.
  • the flexible substrate 111 can be made of polyimide (PI), polycarbonate (PC), polyether sulfone (PES), polyethylene terephthalate (PET) , Polyethylene naphthalate (polyethylene naphthalate It is made of flexible insulating polymer materials such as naphthalate (PEN) and film fiber-reinforced polymer (FRP).
  • the thin film transistor layer 112 includes several thin film transistors. Each thin film transistor includes a gate electrode layer, an insulating layer, an active layer, and a source/drain layer.
  • the plurality of thin film transistors may include hydrogenated amorphous silicon thin film transistors (hydrogenated Amorphous TFTs, referred to as a-TFT: H), low temperature polysilicon thin film transistors (low Temperature poly TFTs, abbreviated as LTPS), organic thin film transistors (Organic TFTs, abbreviated as OTFT) and/or metal oxide thin film transistors, but not limited thereto.
  • the plurality of thin film transistors may be bottom-gate, top-gate or double-gate thin film transistors.
  • the organic light emitting diode layer 113 includes a plurality of organic light emitting diodes for emitting light.
  • the organic light emitting diode may sequentially include an anode layer, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, an electron injection layer, and a cathode layer.
  • the plurality of thin film transistors are electrically connected to the plurality of organic light emitting diodes in the organic light emitting diode layer 113 for driving the plurality of organic light emitting diodes to emit light.
  • the thin-film encapsulation layer 114 is used to protect the organic light-emitting diodes in the organic light-emitting diode layer 113 from corrosion and damage by moisture and oxygen in the atmosphere, and to improve the ability of the flexible display panel 110 to withstand stress.
  • the thin film encapsulation layer 114 may adopt a structure of inorganic layer/organic layer/inorganic layer.
  • the inorganic layer in the thin film encapsulation layer 114 is used to block the organic light-emitting diodes in the organic light-emitting diode layer 113 from contacting moisture and oxygen in the atmosphere, so as to prevent the moisture and oxygen in the atmosphere from corroding and damaging the organic light emitting diode.
  • the inorganic layer may be composed of aluminum oxide, silicon oxide, magnesium oxide, or a combination thereof. Since the organic layer in the thin film encapsulation layer 114 is composed of a soft organic material, it can be used to relieve the stress that the flexible display panel 110 bears.
  • the organic layer may be composed of alucone, or an organic-inorganic hybrid film of aluminum, titanium, zinc, and iron.
  • the flexible touch display device 200 may further include a second insulating layer 160 disposed on the thin film encapsulation layer 114.
  • the touch-sensing structure 120 is formed on the second insulating layer 160.
  • the second insulating layer 160 may be made by a low-temperature process.
  • the second insulating layer 160 may be composed of silicon nitride, silicon oxide, or a combination thereof.
  • the touch-sensing structure 120 is arranged on the flexible display panel 110 and includes several bridge points 121, several sensing electrodes 122, a first insulating layer 130, several touch electrodes 141, and touch electrode leads 142 And a flat layer 150.
  • the plurality of bridge points 121 are arranged on the display area AA of the flexible display panel 110.
  • the plurality of sensing electrodes 122 are disposed on the peripheral area NA of the flexible display panel 110 for sensing the bending position and the bending degree of the flexible display panel 110.
  • the plurality of sensing electrodes 122 may be the same layer and the same material as the plurality of bridge points 121 to avoid additional manufacturing processes.
  • the first insulating layer 130 covers the bridge points 121, the sensing electrodes 122 and the flexible display panel 110.
  • the first insulating layer 130 is provided with a plurality of through holes 131 in the display area AA so as to expose the two opposite sides of each bridge 121.
  • the plurality of touch electrodes 141 are disposed on the first insulating layer 130 in the display area AA, and are electrically connected to the plurality of bridge points 121 through the plurality of through holes 131 to form a metal mesh
  • the structure is used to sense the position where the flexible touch display device 200 is touched.
  • the plurality of touch electrode leads 142 are disposed on the first insulating layer 130 in the peripheral area NA.
  • the binding area 180 is disposed on one side of the flexible display panel 110 and/or the touch-sensing structure 120.
  • the plurality of touch electrode leads 142 can be the same layer and the same material as the plurality of touch electrodes 141, so as to reduce the manufacturing process.
  • the plurality of sensing electrodes 122 can be arranged under the plurality of touch electrode leads 142 to avoid increasing the area of the peripheral area NA, which is beneficial to the design of a narrow frame.
  • the plurality of bridge points 121, the plurality of sensing electrodes 122, the plurality of touch electrodes 141, and the plurality of touch electrode leads 142 may be composed of a metal material with high conductivity and high flexibility.
  • the plurality of bridge points 121, the plurality of sensing electrodes 122, and the plurality of touch electrodes 141 may be single-layer metal structures such as aluminum, titanium, and molybdenum, or aluminum titanium (AlTi), molybdenum aluminum (MoAl), etc. Double-layer metal structure, or three-layer metal structure such as titanium aluminum titanium (TiAlTi) and molybdenum aluminum molybdenum (MoAlMo).
  • the flat layer 150 covers the plurality of touch electrodes 141, the plurality of touch electrode leads 142 and the first insulating layer 130.
  • the flat layer 150 may be composed of an organic photoresist material.
  • the touch-sensing structure 120 can be formed on the flexible display panel 110 by using a low-temperature process (each process temperature is less than 90° C.).
  • the bridge points 121 are arranged in an array in the second display area AA.
  • the distance between each column of bridge points 121 is equal, and the distance between each column of bridge points 121 is equal.
  • the plurality of sensing electrodes 122 are arranged on the second peripheral area NA in the same row or in the same row as the bridge point 121.
  • the flexible touch display device 200 further includes a scroll 400 connected to one side of the flexible touch display device 200 for rolling up or unfolding the flexible touch display device.
  • the plurality of sensing electrodes 122 are disposed on one or both sides parallel to the reel 400 in the second peripheral area NA. The distances between the plurality of sensing electrodes 122 are equal.
  • one end of the plurality of touch electrode leads 142 is electrically connected to the plurality of touch electrodes 141, and the other end is bound to the bonding area 180 and electrically connected to the touch chip 300.
  • the plurality of sensing electrodes 122 can be electrically connected to the touch chip 300 through the plurality of sensing electrode leads 123.
  • the plurality of sensing electrode leads 123 are bound to the binding area 180.
  • the sensing electrode 122 at the bent position When the flexible touch display device 200 is touched in a bent state, the sensing electrode 122 at the bent position generates a bending signal to the touch chip 300; the touch chip 300 recognizes the bent position through the bending signal After the degree of bending, the touch signal generated by the touch electrode 141 at the bending position is compensated and corrected. In this way, the capacitance value of the touch electrode 141 at the bent position is prevented from changing due to the change in the pitch, thereby preventing misjudgment of the touch position.
  • the plurality of sensing electrodes 122 are mutual capacitance sensing electrodes 80.
  • FIGS. 9-11 are schematic diagrams of three different designs of the mutual capacitive sensing electrode 80.
  • Each mutual capacitive sensing electrode 80 includes a transmitting electrode 60 and a receiving electrode 70, and the transmitting electrode 60 and the receiving electrode 70 form a capacitance.
  • the flexible touch display device 200 is bent, the distance between the transmitting electrode 60 and the receiving electrode 70 in the mutual-capacitive sensing electrode 80 in the bent position changes, thereby changing the distance between the transmitting electrode 60 and the receiving electrode 70.
  • the bending signal is the capacitance change between the transmitting electrode 60 and the receiving electrode 70 in the mutual capacitance sensing electrode 80 in the bending position.
  • the transmitting electrode 60 and the receiving electrode 70 are designed to be comb-shaped, but not limited to this. As long as it conforms to the design that each transmitting electrode 60 and a receiving electrode 70 are interlaced and achieves the effect of a mutual capacitive sensing electrode, it is applicable to the present invention. That is, FIGS. 9-11 are only used to illustrate the transmitting electrode 60 and the receiving electrode 70 of the mutual-capacitive sensing electrode 80, and are not used to limit the present invention. Any design similar to Figures 9-11 is also within the protection scope of this application. The spacing between the plurality of mutual capacitive sensing electrodes 80 may be equal.
  • the sensing electrode lead 123 includes a transmitting electrode lead 61 and a plurality of receiving electrode leads 71.
  • the plurality of emitter electrodes 60 are electrically connected to the emitter electrode lead 61.
  • Each receiving electrode 70 is electrically connected to each receiving electrode lead 71.
  • the transmitting electrode lead 61 and the plurality of receiving electrode leads 71 are bound to the binding area 180 and electrically connected to the touch chip 300.
  • the touch chip 300 sequentially emits excitation signals through the emitting electrode lead 61 and the plurality of emitting electrodes 60.
  • the plurality of receiving electrodes 70 sequentially receive excitation signals and then transmit them back to the touch chip 300 through the receiving electrode leads 71. In this way, the touch chip 300 can obtain the capacitance values of all the mutual-capacitive sensing electrodes 80, calculate the capacitance change of each mutual-capacitive sensing electrode 80, and then calculate the bending position and the degree of bending.
  • the plurality of sensing electrodes 122 may be another type of mutual capacitance sensing electrode 90, which includes a plurality of driving sensing lines 91 and receiving sensing lines perpendicular to each other. 92.
  • the driving sensing line 91 includes a plurality of first electrodes 93 connected in series.
  • the driving sensing line 92 includes a plurality of second electrodes 94 connected in series.
  • the first electrode 93 and the second electrode 94 are diamond-shaped, but not limited thereto.
  • FIG. 12 and 13 the plurality of sensing electrodes 122 may be another type of mutual capacitance sensing electrode 90, which includes a plurality of driving sensing lines 91 and receiving sensing lines perpendicular to each other. 92.
  • the driving sensing line 91 includes a plurality of first electrodes 93 connected in series.
  • the driving sensing line 92 includes a plurality of second electrodes 94 connected in series.
  • the first electrode 93 and the second electrode 94 are diamond-shaped, but not limited
  • the first electrode 93 and the second electrode 94 are arranged on the same layer, and the connecting line 98 between the second electrodes 94 is curved to cross the connecting line 97 between the first electrodes 93.
  • the driving sensing line 91 and the receiving sensing line 92 are respectively arranged on different planes, and a dielectric layer (not shown) is provided between the two planes.
  • the driving sensing line 91 and the receiving sensing line 92 form a capacitor at the intersection.
  • the bending signal is the capacitance change between the driving sensing line 91 and the receiving sensing line 92 at the bending position.
  • the sensing electrode lead 123 includes a plurality of transmitting leads 95 and a plurality of receiving leads 96. Each of the driving sensing lines 91 is electrically connected to the emitting lead 95. Each receiving sensing wire 92 is electrically connected to each receiving lead 96.
  • the plurality of transmitting leads 95 and the plurality of receiving leads 96 are bound to the bonding area 180 and electrically connected to the touch chip 300.
  • the touch chip 300 sequentially sends excitation signals through the plurality of transmitting leads 95 and the plurality of driving sensing lines 91, and the plurality of receiving sensing lines 92 sequentially receives excitation signals through the plurality of receiving leads 96
  • the signal is transmitted back to the touch chip 300.
  • the touch chip 300 can obtain the capacitance values of all intersections, calculate the capacitance change at each intersection, and then calculate the bending position and the degree of bending.
  • the plurality of sensing electrodes 122 may be self-capacitance sensing electrodes 700, which include a plurality of first conductive lines 701 and perpendicularly intersecting them. Several second conductive lines 702. Each first conductive wire 701 includes a plurality of first electrodes 703 connected in series. Each second conductive wire 702 includes a plurality of second electrodes 704 connected in series. In this embodiment, the first electrode 703 and the second electrode 704 are diamond-shaped, but not limited thereto. In this embodiment, please refer to FIG.
  • first electrode 703 and the second electrode 704 are arranged on the same layer, and the connecting line 708 between the second electrodes 704 is bent across the connecting line 707 between the first electrodes 703.
  • first conductive wire 701 and the second conductive wire 702 are respectively arranged on different planes, and a dielectric layer (not shown) is arranged between the two planes.
  • One end of each first conductive wire 701 and each second conductive wire 702 is grounded (not shown), and a capacitance is generated between the ground and the ground.
  • the sensing electrode lead 123 includes a plurality of first leads 705 and a plurality of second leads 706. Each of the first conductive wires 701 is electrically connected to each of the first leads 705. Each second conductive wire 702 is electrically connected to each second lead 706.
  • the plurality of first leads 705 and the plurality of second leads 706 are bound to the bonding area 180 and electrically connected to the touch chip 300.
  • the touch chip 300 sequentially detects a plurality of first conductive wires 701 extending in the same direction, and then sequentially detects a plurality of second conductive wires 702 extending in another direction, so as to obtain each first conductive wire 701 and Each second conductive line 702 has a capacitance value between it and the ground. In this way, the capacitance change between each first conductive line 701 and each second conductive line 702 and the ground is calculated, and then the bending position and the bending degree are calculated.
  • the plurality of sensing electrodes 122 may be resistive sensing electrodes 800, which include two conductive layers 801 and a plurality of spacers 802 separating the two conductive layers.
  • the plurality of spacers 802 are used to keep the two conductive layers 801 apart by a certain distance. When the flexible touch display device 200 is bent, the two conductive layers 801 will contact each other at the bent position. In other words, the plurality of spacers 802 are used to prevent the two conductive layers 801 from being short-circuited due to contact when the flexible touch display device 200 is not bent, thereby avoiding malfunctions.
  • the plurality of spacers 802 can be made of polyester material, and can be designed to be spherical.
  • the two conductive layers 801 at the bent position are in contact with each other and cause a short circuit, thereby generating a voltage drop.
  • the bending signal is the amount of voltage change between the two conductive layers 801 at the bending position.
  • the touch chip is electrically connected to the two conductive layers 801 to detect the voltage between the two conductive layers 801, calculate the voltage change, and then calculate the bending position and the degree of bending.
  • the flexible touch display device senses the bending position and the degree of bending of the flexible touch display device by arranging several sensing electrodes in the peripheral area, and then the contact between the touch electrodes at the bending position The capacitance value is compensated and corrected.
  • the plurality of sensing electrodes can be arranged under the plurality of touch electrode leads in the peripheral area, so as to avoid increasing the area of the peripheral area, which is beneficial to the design of a narrow frame.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

本揭示公开一种柔性触控显示装置，其包含柔性显示面板、数个桥点、数个感应电极、第一绝缘层及数个触控电极。桥点及感应电极分别设置在柔性显示面板的显示区及周边区。第一绝缘层覆盖桥点、感应电极及柔性显示面板。第一绝缘层在显示区内设有数个通孔，以使每个桥点的两相对侧部分露出。触控电极设置在显示区内的第一绝缘层上，并通过通孔与桥点电连接，以形成金属网格结构。感应电极用于感测柔性触控显示装置的弯曲位置及弯曲程度，以对在弯曲位置的触控电极所感测到的触碰位置进行补偿校正。

Description

柔性触控显示装置 技术领域
本揭示涉及显示技术领域，特别是涉及一种柔性触控显示装置。
 背景技术
有机发光二极管（Organic Light-Emitting Diode，OLED）显示面板具有轻薄、主动发光、响应速度快、可视角大、色域宽、亮度高、功耗低及具可挠性等优点，成为显示面板技术中的主流。将有机发光二极管显示面板结合触控结构的柔性触控显示装置更是现今业界研发的重点。
请参阅图1，目前的柔性触控显示装置100包含一有机发光二极管显示面板10及设置在有机发光二极管显示面板10上的数个第一触控电极21和数个第二触控电极22。所述数个第一触控电极21和数个第二触控电极22组成呈金属网格（metal mesh）状的互容式触控电极。所述数个第一触控电极21和数个第二触控电极22通过引线电连接于触控芯片。当手指或手写笔触碰柔性触控显示装置100的触控显示区域中的某一位置时，会使所述触碰位置下的第一触控电极21和第二触控电极22之间的电容值发生变化。触控芯片可藉由所述电容值的变化识别所述触碰位置。
 技术问题
如图2所示，当所述柔性触控显示装置100处于弯曲状态时，所述第一触控电极21和第二触控电极22之间的距离会发生变化，使得第一触控电极21和第二触控电极22之间的电容值也随之发生变化，进而使触控芯片误判触碰位置。
因此有需要研发一种新的柔性触控显示装置，来解决现有的柔性触控显示装置在弯曲时弯曲处的触控电极间的电容值发生变化而造成触碰位置误判的技术问题。
 技术解决方案
为了解决现有的柔性触控显示装置在弯曲时易发生触控位置误判的技术问题，本揭示提供了一种柔性触控显示装置，其包含一柔性显示面板、数个桥点、数个感应电极、一第一绝缘层及数个触控电极。所述柔性显示面板包含一显示区及围绕所述显示区的一周边区。所述数个桥点设置在所述柔性显示面板的显示区上。所述数个感应电极设置在所述柔性显示面板的周边区上，用于感测所述柔性显示面板的弯曲位置及弯曲程度。所述第一绝缘层覆盖所述数个桥点、数个感应电极及柔性显示面板。所述第一绝缘层在所述显示区内设有数个通孔，以使每个桥点的两相对侧部分露出。所述数个触控电极设置在所述显示区内的第一绝缘层上，并通过所述数个通孔与所述数个桥点电连接，以形成一金属网格结构，用于感测所述柔性触控显示装置被触碰的位置。
在一实施例中，所述柔性触控显示装置还包含数个触控电极引线及一触控芯片。所述数个触控电极引线设置在所述周边区内的第一绝缘层上，且电连接所述数个触控电极。所述触控芯片电连接于所述数个触控电极引线。当触碰显示区时，触碰位置下的数个触控电极产生一触碰信号。所述触碰信号通过触控电极引线传送至所述触控芯片。所述触控芯片通过所述触碰信号识别所述触碰位置。
在一实施例中，所述触碰信号为所述触碰位置下数个触控电极之间的电容变化量。
在一实施例中，所述数个感应电极电连接于所述触控芯片。当柔性触控显示装置在弯曲状态下被触碰时，在弯曲位置下的感应电极产生一弯曲信号给所述触控芯片。所述触控芯片通过所述弯曲信号识别弯曲位置及弯曲程度后，对在弯曲位置下的触控电极所产生的触碰信号进行补偿校正。
在一实施例中，每一感应电极包含一呈梳状的发射电极及一呈梳状的接收电极，且所述发射电极与所述接收电极形成一电容。所述弯曲信号为弯曲位置下的感应电极中的发射电极及接收电极之间的电容变化量。
在一实施例中，所述所述数个感应电极包含数个发射电极线及与其互相垂直交叉的接收电极线。每一发射电极线与每一接收电极线在交叉处形成一电容。所述弯曲信号为弯曲位置下的导电线在交叉处的电容变化量。
在一实施例中，所述所述数个感应电极包含互相垂直交叉的数个导电线，所述数个导电线分别与地之间产生电容。所述弯曲信号为弯曲位置下的导电线与地之间的电容变化量。
在一实施例中，所述数个感应电极包含两导电层及分隔所述两导电层的数个间隔物(spacer)。所述弯曲信号为弯曲位置下两导电层因互相接触而产生的电压变化量。
在一实施例中，所述柔性触控显示装置还包含一卷轴，连接于所述柔性触控显示装置的一侧，用于卷起或展开所述柔性触控显示装置。所述数个感应电极设置于所述周边区中与所述卷轴平行的一侧。
在一实施例中，所述数个桥点在所述显示区内呈阵列排布。所述数个感应电极设置于所述周边区上与所述数个桥点同行或同列。
 有益效果
相较于现有的柔性触控显示装置，本揭示所提供的一种柔性触控显示装置藉由在周边区设置数个感应电极，用以感测柔性触控显示装置的弯曲位置及弯曲程度，进而对在弯曲位置的触控电极间的电容值进行补偿校正。藉此，解决现有的柔性触控显示装置在弯曲时弯曲处的触控电极间的电容值发生变化而造成触控位置误判的技术问题。再者，所述数个感应电极可设置在周边区内的数个触控电极引线的下方，以避免增加周边区的面积，而有利于窄边框的设计。
 附图说明
为了更清楚地说明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单介绍，显而易见地，下面描述中的附图仅仅是发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为现有的柔性触控显示装置处于平坦状态时的剖面示意图。
图2为现有的柔性触控显示装置处于弯曲状态时的剖面示意图。
图3为本揭示实施例的柔性触控显示装置的示意图。
图4为图3的柔性触控显示装置沿B-B’线的剖面示意图。
图5为本揭示实施例的柔性触控显示装置中桥点及感应电极的第一种设置示意图。
图6为本揭示实施例的柔性触控显示装置中桥点及感应电极的第二种设置示意图。
图7为图3的X区中触控电极及触控电极引线的设置示意图。
图8为图3的Y区中感应电极及感应电极引线的设置示意图。
图9为图8的感应电极为第一种互容式感应电极的示意图。
图10为图8的感应电极为第二种互容式感应电极的示意图。
图11为图8的感应电极为第三种互容式感应电极的示意图。
图12为图8的感应电极为另一种互容式感应电极的示意图。
图13为图12的互容式感应电极的局部放大图。
图14为图8的感应电极为自容式感应电极的示意图。
图15为图14的自容式感应电极的局部放大图。
图16为图4的感应电极为电阻式感应电极的示意图。
 本发明的实施方式
下面将结合附图，对本揭示实施例中的技术方案进行清楚、完整地描述。本领域技术人员在没有作出创造性劳动前提下基于本揭示实施例所获得的其他实施例，都属于本发明保护的范围。此外，本揭示所提到的方向术语，例如「上」、「下」、「平行」及「垂直」，仅是参考附加图式的方向，用以说明本发明，而非用以限制本发明。再者，数量术语“一”，除非另有明确的限定，意图包括复数。术语“第一”、“第二”仅用来描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。
请参阅图3及图4。本揭示实施例的柔性触控显示装置200包含一柔性显示面板110、一触控-感应结构120、一绑定区180及一触控芯片300。所述柔性显示面板110包含一显示区AA及围绕所述显示区AA的一周边区NA。所述柔性显示面板110可为一有机发光二极管显示面板，其从下到上依序包含一柔性基板111、一薄膜晶体管层112、一有机发光二极管层113及一薄膜封装层114。所述触控-感应结构120形成于所述薄膜封装层114上。所述柔性基板111可由聚酰亚胺(polyimide，PI)、聚碳酸酯(polycarbonate，PC)、聚醚砜(polyether sulfone，PES)、聚对苯二甲酸乙二醇酯(polyethylene terephthalate，PET)、聚萘二甲酸乙二醇酯(polyethylene naphthalate，PEN)、及薄膜纤维增强聚合物(fiber-reinforced polymer，FRP)等柔性绝缘聚合物材料所制成。所述薄膜晶体管层112包含数个薄膜晶体管。每一薄膜晶体管包含一栅电极层、一绝缘层、一有源层及一源漏极层。所述数个薄膜晶体管可包含氢化非晶硅薄膜晶体管(hydrogenated amorphous TFTs，简称a-TFT:H)、低温多晶硅薄膜晶体管(low temperature poly TFTs，简称LTPS)、有机薄膜晶体管(Organic TFTs，简称OTFT)及/或金属氧化物薄膜晶体管，但不限于此。所述数个薄膜晶体管可为底栅型、顶栅型或双栅型薄膜晶体管。有机发光二极管层113包含数个有机发光二极管，用以发出光线。所述有机发光二极管可依序包含有一阳极层、一空穴注入层、一空穴传输层、一发光层、一电子传输层、一电子注入层及一阴极层。所述数个薄膜晶体管电连接于所述有机发光二极管层113内的数个有机发光二极管，用于驱动所述数个有机发光二极管发光。所述薄膜封装层114是用于保护有机发光二极管层113内的有机发光二极管不受大气中的水气和氧气腐蚀损坏，并提高所述柔性显示面板110承受应力的能力。所述薄膜封装层114可采用无机层/有机层/无机层的结构。所述薄膜封装层114中的无机层用于阻隔所述有机发光二极管层113内的有机发光二极管接触到大气中的水气和氧气，以避免大气中的水气和氧气腐蚀损坏所述有机发光二极管。所述无机层可由氧化铝、氧化硅、氧化镁或其组合所组成。所述薄膜封装层114中的有机层因由柔软的有机材料组成，而可用于缓释所述柔性显示面板110所承受的应力。所述有机层可由烷氧基铝(alucone)组成，或为铝、钛、锌、铁的有机-无机杂化膜。在一实施例中，所述柔性触控显示装置200还可包含一第二绝缘层160，其设置在薄膜封装层114上。所述触控-感应结构120形成于所述第二绝缘层160上。第二绝缘层160可采用低温工艺制成。第二绝缘层160可由氮化硅、氧化硅或其组合所组成。
所述触控-感应结构120设置在设置在柔性显示面板110上，包含数个桥点121、数个感应电极122、一第一绝缘层130、数个触控电极141、触控电极引线142及一平坦层150。所述数个桥点121设置在所述柔性显示面板110的显示区AA上。所述数个感应电极122设置在所述柔性显示面板110的周边区NA上，用于感测所述柔性显示面板110的弯曲位置及弯曲程度。所述数个感应电极122可与所述数个桥点121同层且同材料，以避免增加额外的制程。所述第一绝缘层130覆盖于所述数个桥点121、数个感应电极122及柔性显示面板110上。所述第一绝缘层130在所述显示区AA内设有数个通孔131，以使每个桥点121的两相对侧部分露出。所述数个触控电极141设置在所述显示区AA内的第一绝缘层130上，并通过所述数个通孔131与所述数个桥点121电连接，以形成一金属网格结构，用于感测所述柔性触控显示装置200被触碰的位置。所述数个触控电极引线142设置在所述周边区NA内的第一绝缘层130上。绑定区180设置在所述柔性显示面板110及/或所述触控-感应结构120一侧。所述数个触控电极引线142可与所述数个触控电极141同层且同材料，以减少制程。所述数个感应电极122可设置在所述数个触控电极引线142的下方，以避免增加周边区NA的面积，有利于窄边框的设计。所述数个桥点121、数个感应电极122、数个触控电极141及所述数个触控电极引线142可由一高导电性且高可弯性的金属材料所组成。具体地，所述数个桥点121、数个感应电极122及数个触控电极141可为铝、钛及钼等单层金属结构，或是铝钛(AlTi)及钼铝(MoAl)等双层金属结构，或是钛铝钛(TiAlTi)及钼铝钼(MoAlMo)等三层金属结构。所述平坦层150覆盖于所述数个触控电极141、数个触控电极引线142及第一绝缘层130上。所述平坦层150可由一有机光阻材料所组成。所述触控-感应结构120可采用低温工艺(各制程温度小于90℃)形成于所述柔性显示面板110上。
请参阅图5，在一实施例中，所述数个桥点121在所述第二显示区AA内呈阵列排布。每一列桥点121的间距相等，且每一列桥点121的间距相等。所述数个感应电极122设置于所述第二周边区NA上与所述桥点121同行或同列。
请参阅图6，在一实施例中，所述柔性触控显示装置200还包含一卷轴400，连接于所述柔性触控显示装置200的一侧，用于卷起或展开所述柔性触控显示装置200。所述数个感应电极122设置于所述第二周边区NA中与所述卷轴400平行的一或两侧。所述数个感应电极122的间距相等。
请参阅图7，所述数个触控电极引线142的一端电连接于所述数个触控电极141，另一端绑定于绑定区180且电连接触控芯片300。
请参阅图8，所述数个感应电极122可通过数个感应电极引线123电连接触控芯片300。所述数个感应电极引线123绑定于绑定区180。当手指或手写笔触碰显示区AA时，触碰位置下的数个触控电极141之间的电容值发生变化，而形成一触碰信号。亦即，所述触碰信号为所述触碰位置下数个触控电极141之间的电容变化量。接着，所述触碰信号通过触控电极引线142传送至所述触控芯片300。所述触控芯片300通过触碰信号识别所述触碰位置。当柔性触控显示装置200在弯曲状态下被触碰时，在弯曲位置下的感应电极122产生一弯曲信号给所述触控芯片300；所述触控芯片300通过所述弯曲信号识别弯曲位置及弯曲程度后，对在弯曲位置下的触控电极141所产生的触碰信号进行补偿校正。藉此，避免在弯曲位置的触控电极141因间距变化导致电容值变化，进而避免触控位置误判。在此实施例中，所述数个感应电极122为互容式(mutualcapacitance)感应电极80。
请参阅图9-11，其为互容式感应电极80的三种不同设计的示意图。每一互容式感应电极80包含一发射电极60及一接收电极70，且所述发射电极60与所述接收电极70形成一电容。当所述柔性触控显示装置200弯曲时，弯曲位置下的互容式感应电极80中的发射电极60及接收电极70的间距产生变化，进而改变所述发射电极60及所述接收电极70之间的电容值。所述弯曲信号即为弯曲位置下的互容式感应电极80中的发射电极60及接收电极70之间的电容变化量。在此实施例中，发射电极60及接收电极70设计为梳状，但不以此为限。只要符合每一发射电极60与一接收电极70交错配合且达到互容式感应电极功效的设计皆适用于本发明。亦即，图9-11仅用于例示互容式感应电极80的发射电极60及接收电极70，而非用于限制本发明。任何与图9-11相似的设计亦在本申请保护范围内。所述数个互容式感应电极80之间的间距可相等。所述感应电极引线123包含一发射电极引线61及数个接收电极引线71。所述数个发射电极60电连接于所述发射电极引线61。每一接收电极70电连接于每一接收电极引线71。所述发射电极引线61及所述数个接收电极引线71绑定于所述绑定区180并电连接于触控芯片300。所述触控芯片300通过所述发射电极引线61及所述数个发射电极60依序发出激励信号。所述数个接收电极70依序接收激励信号后通过所述接收电极引线71回传至所述触控芯片300。藉此，所述触控芯片300可得到所有互容式感应电极80的电容值，并计算出每个互容式感应电极80的电容变化量，进而计算出弯曲位置及弯曲程度。
在一实施例中，请参图12及图13，所述数个感应电极122可为另一种互容式感应电极90，其包含数个驱动感应线91及与其互相垂直交叉的接收感应线92。驱动感应线91包含数个彼此串接的第一电极93。驱动感应线92包含数个彼此串接的第二电极94。在此实施例中，第一电极93及第二电极94为菱形，但不限于此。在此实施例中，请参图13，第一电极93及第二电极94设置在同一层，第二电极94间的连接线98曲起跨越第一电极93间的连接线97。在另一实施例，驱动感应线91及接收感应线92分别设置在不同的平面，两平面之间设有一介电层(图未示)。驱动感应线91及接收感应线92在交叉处形成一电容。当所述柔性触控显示装置200弯曲时，弯曲位置下的驱动感应线91及接收感应线92在交叉处产生形变，进而改变驱动感应线91及接收感应线92在交叉处的电容值。所述弯曲信号即为弯曲位置下驱动感应线91及接收感应线92之间的电容变化量。所述感应电极引线123包含数个发射引线95及数个接收引线96。所述每一驱动感应线91电连接于所述发射引线95。每一接收感应线92电连接于每一接收引线96。所述数个发射引线95及所述数个接收引线96绑定于所述绑定区180并电连接于触控芯片300。所述触控芯片300通过所述数个发射引线95及所述数个驱动感应线91依序发出激励信号，且所述数个接收感应线92通过所述数个接收引线96依序接收激励信号后回传至所述触控芯片300。藉此，所述触控芯片300可得到所有交叉处的电容值，并计算出每个交叉处的电容变化量，进而计算出弯曲位置及弯曲程度。
在一实施例中，请参图14及图15，所述数个感应电极122可为自容式(self-capacitance)感应电极700，其包含数个第一导电线701及与其互相垂直交叉的数个第二导电线702。每一第一导电线701包含数个彼此串接的第一电极703。每一第二导电线702包含数个彼此串接的第二电极704。在此实施例中，第一电极703及第二电极704为菱形，但不限于此。在此实施例中，请参图15，第一电极703及第二电极704设置在同一层，第二电极704间的连接线708曲起跨越第一电极703间的连接线707。在另一实施例，第一导电线701及第二导电线702分别设置在不同的平面，两平面之间设有一介电层(图未示)。每一第一导电线701及每一第二导电线702的一端接地(图未示)，与地之间产生电容。当所述柔性触控显示装置200弯曲时，弯曲位置下的第一导电线701及第二导电线702产生形变，进而改变所述第一导电线701及第二导电线702与地的电容值。所述弯曲信号即为弯曲位置下的整条第一导电线701及整条第二导电线702与地之间的电容变化量。所述感应电极引线123包含数个第一引线705及数个第二引线706。所述每一第一导电线701电连接于所述每一第一引线705。每一第二导电线702电连接于每一第二引线706。所述数个第一引线705及所述数个第二引线706绑定于所述绑定区180并电连接于触控芯片300。所述触控芯片300依序检测在同一方向延伸的数个第一导电线701，再依序检测在另一方向延伸的数个第二导电线702，以得到每一第一导电线701及每一第二导电线702各别与地之间的电容值。藉此，计算出每一第一导电线701及每一第二导电线702各别与地之间的电容变化量，进而计算出弯曲位置及弯曲程度。
在一实施例中，请参图16，所述数个感应电极122可为电阻式感应电极800，其包含两导电层801及分隔所述两导电层的数个间隔物(spacer)802。所述数个间隔物802是用于使所述两导电层801相距一定距离，当所述柔性触控显示装置200弯曲时，所述两导电层801才会在弯曲位置相接触。换句话说，所述数个间隔物802是用于避免所述柔性触控显示装置200未弯曲时所述两导电层801因接触而短路，进而避免产生误动作。所述数个间隔物802可由聚酯材料所制成，且可设计成球形。当所述柔性触控显示装置200弯曲时，弯曲位置下的两导电层801因互相接触而造成短路，进而产生压降。所述弯曲信号即为弯曲位置下两导电层801间的电压变化量。所述触控芯片电连接至所述两导电层801，以检测所述两导电层801间的电压，并计算出电压变化量，进而计算出弯曲位置及弯曲程度。
本揭示所提供的一种柔性触控显示装置藉由在周边区设置数个感应电极，用以感测柔性触控显示装置的弯曲位置及弯曲程度，进而对在弯曲位置的触控电极间的电容值进行补偿校正。藉此，解决现有的柔性触控显示装置在弯曲时弯曲处的触控电极间的电容值发生变化而造成触控位置误判的技术问题。再者，所述数个感应电极可设置在周边区内的数个触控电极引线的下方，以避免增加周边区的面积，而有利于窄边框的设计。
虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (10)

  1. 一种柔性触控显示装置，其包含：
    一柔性显示面板，包含一显示区及围绕所述显示区的一周边区；
    数个桥点，设置在所述柔性显示面板的显示区上；
    数个感应电极，设置在所述柔性显示面板的周边区上，用于感测所述柔性显示面板的弯曲位置及弯曲程度；
    一第一绝缘层，覆盖所述数个桥点、数个感应电极及柔性显示面板，其中所述第一绝缘层在所述显示区内设有数个通孔，以使每个桥点的两相对侧部分露出；以及
    数个触控电极，设置在所述显示区内的第一绝缘层上，并通过所述数个通孔与所述数个桥点电连接，以形成一金属网格结构，用于感测所述柔性触控显示装置被触碰的位置。
  2. 根据权利要求1所述的柔性触控显示装置，其还包含：
    数个触控电极引线，设置在所述周边区内的第一绝缘层上且电连接所述数个触控电极；以及
    一触控芯片，电连接于所述数个触控电极引线；
    其中当触碰显示区时，触碰位置下的数个触控电极产生一触碰信号，所述触碰信号通过触控电极引线传送至所述触控芯片，所述触控芯片通过所述触碰信号识别所述触碰位置。
  3. 根据权利要求2所述的柔性触控显示装置，其中所述触碰信号为所述触碰位置下数个触控电极之间的电容变化量。
  4. 根据权利要求2所述的柔性触控显示装置，其中所述数个感应电极电连接于所述触控芯片，当柔性触控显示装置在弯曲状态下被触碰时，在弯曲位置下的感应电极产生一弯曲信号给所述触控芯片；所述触控芯片通过所述弯曲信号识别弯曲位置及弯曲程度后，对在弯曲位置下的触控电极所产生的触碰信号进行补偿校正。
  5. 根据权利要求4所述的柔性触控显示装置，其中每一感应电极包含一呈梳状的发射电极及一呈梳状的接收电极，且所述发射电极与所述接收电极形成一电容，所述弯曲信号为弯曲位置下的感应电极中的发射电极及接收电极之间的电容变化量。
  6. 根据权利要求4所述的柔性触控显示装置，其中所述所述数个感应电极包含数个发射电极线及与其互相垂直交叉的接收电极线，每一发射电极线与每一接收电极线在交叉处形成一电容，所述弯曲信号为弯曲位置下的导电线在交叉处的电容变化量。
  7. 根据权利要求4所述的柔性触控显示装置，其中所述所述数个感应电极包含互相垂直交叉的数个导电线，所述数个导电线分别与地之间产生电容，所述弯曲信号为弯曲位置下的导电线与地之间的电容变化量。
  8. 根据权利要求4所述的柔性触控显示装置，其中所述数个感应电极包含两导电层及分隔所述两导电层的数个间隔物，所述弯曲信号为弯曲位置下两导电层因互相接触而产生的电压变化量。
  9. 根据权利要求1所述的柔性触控显示装置，其还包含一卷轴，连接于所述柔性触控显示装置的一侧，用于卷起或展开所述柔性触控显示装置；其中所述数个感应电极设置于所述周边区中与所述卷轴平行的一侧。
  10. 根据权利要求1所述的柔性触控显示装置，其中所述数个桥点在所述显示区内呈阵列排布，且所述数个感应电极设置于所述周边区上与所述数个桥点同行或同列。
PCT/CN2020/077051 2020-01-22 2020-02-27 柔性触控显示装置 Ceased WO2021147136A1 (zh)

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